package com.lagou.config;

import com.lagou.io.Resources;
import com.lagou.pojo.Configuration;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;


import java.beans.PropertyVetoException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;

public class XMLconfigBuilder {

 private Configuration configuration;

 public XMLconfigBuilder(){
     this.configuration = new Configuration();
 }
    /**
     *  将配置文件进行解析，封装成 Configuration
     *  使用dom4j 来解析
     * @param in
     * @return
     */
    public Configuration parseConfig(InputStream in) throws DocumentException, PropertyVetoException {
        Document document = new SAXReader().read(in);
        // configuration
        Element rootElement = document.getRootElement();
        List<Element> list = rootElement.selectNodes("//property");
        Properties properties = new Properties();
        for (Element element:list) {
            String name = element.attributeValue("name");
            String value = element.attributeValue("value");
            properties.setProperty(name,value);
        }
        ComboPooledDataSource comboPooledDataSource = new  ComboPooledDataSource();
        comboPooledDataSource.setDriverClass(properties.getProperty("driverClass"));
        comboPooledDataSource.setJdbcUrl(properties.getProperty("jdbcUrl"));
        comboPooledDataSource.setUser(properties.getProperty("username"));
        comboPooledDataSource.setPassword(properties.getProperty("password"));

        configuration.setDataSource(comboPooledDataSource);
        // mapper.xml 解析： 拿到路径-- 字节输入流 -- dom4j 进行解析
        List<Element> mapperList = rootElement.selectNodes("//mapper");
        for (Element element:mapperList) {
            String mapperPath = element.attributeValue("resource");
            InputStream resourceAsStream = Resources.getResourceAsStream(mapperPath);
            XMLMapperBuilder xMlMapperBuilder = new XMLMapperBuilder(configuration);
            xMlMapperBuilder.parse(resourceAsStream);
        }

        return configuration;

    }

}
